Coffee machine



FIG. 1 is a right-side elevational view of a coffee machine showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left-side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a top, front, right perspective view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in FIGS. 1-7 depict portions of the coffee machine that form no part of the claimed design. 

CLAIM The ornamental design for a coffee machine, as shown and described. 